2-6 Connections Model 6485 and 6487 User’s Manual
WARNING The maximum safe voltage between picoammeter LO and chassis
ground (common mode voltage) is 42V. The Model 6485 does not
internally limit the LO-to-chassis voltage. Exceeding 42V can create a
shock hazard.
If it is possible for the DUT or external supply to
present more than
42V to the input HI, it is imperative that the connection between input
LO and the external voltage source be sufficiently low impedance and
capable of carrying the short-circuit current of the source, in order
that the LO not exceed 42V.
CAUTION The
LO to chassis breakdown voltage is 500V. Exceeding this voltage
may cause damage to the instrument.
Figure 2-6
Shielding for Model 6485 measurements (unguarded)
HI
LO
DUT
Metal Noise Shield
B. Safety Shield
Metal Safety
Shield
Safety
Earth
Ground
HI
LO
DUT
INPUT
(
220V
Peak)
Metal Noise Shield
A. Noise Shield
INPUT
(
220V
Peak)
Model 6487 DUT connections
Current measurement connections
Basic connections for current measurements are shown in Figure 2-7; the DUT is the cur-
rent to be measured. Circuit high is connected to th
e center conductor of the input connec-
tor and circuit low is connected to the
connector’s input LO (inner shield).
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